kukudedaxia opened a new issue #10431: 图例太多设置分页效果，监听lengendscroll事件，获取可利用数据 URL: https://github.com/apache/incubator-echarts/issues/10431 ### What problem does this feature solve? 图例太多设置分页效果，然后想利用legend的select属性控制展示符合要求的折线图，监听lengendscroll事件，可以拿到左边第一个index值，但图列分页是通过自适应长度来显示的，每一页个数不确定，导致无法确定切换legend分页时，能够锁定该页的legend具体值。 ### What does the proposed API look like? 期望lengendsroll返回 加一个结尾index { type: 'legendscroll', scrollDataIndex: number， scrollDataLastIndex: number, legendId: string } <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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